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mdpi.com
article
https://www.mdpi.com/2076-3417/9/10/2008
For soil slope applications, Alabama Department of Transportation (DOT) specifies that the geosynthetic reinforcement (either geogrid or geotextile) shall be constructed of polyester, polypropylene, or polyethylene, resistant to all naturally occurring alkaline and acidic soil conditions, and resistant to heat, ultraviolet light, and to attack by bacteria and fungi in the soil . Reinforcement for soil slopes shall be any geosynthetic whose strength in the machine direction equals or exceeds the [...] Geosynthetic specifications include general requirements, specific geosynthetic properties, seams and overlaps, placement procedures, repairs, and acceptance and rejection criteria . Specified general requirements include the types of geosynthetics, acceptable polymeric materials, and guidelines for the stability of the materials as well as instructions for storage and handling, roll weight, and dimensions and certification requirements. Physical, index, and performance properties are also [...] | | |
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| H = 6.1 m | (height) |
| β = 70° | (slope angle) |
| q = 10.1 kN/m2 | (surcharge load) |
| c = 0 | (soil cohesion) |
| ϕ = 32° | (soil internal friction angle) |
| γ = 20 kN/m3 | (soil unit weight) |
| FSdesign = 1.30 | (design factor of safety) |
| FSgrid = 2.75 | (geogrid factor of safety) |
| Tult = 65.7 kN/m | (geogrid tensile strength) |
| ru = 0.25 | (pore water pressure coefficient) |
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library.ctr.utexas.edu
research
https://library.ctr.utexas.edu/hostedpdfs/tsusm/0-6792-1.pdf
Geosynthetic Material: Reinforcement: Polyester Geogrid (3600 lb/ft) Facing: Welded Wire Forms Foundation Soil: Silty-Sand Slope Height: 26 ft Slope Angle: 1H:1V Construction Specifications: South Carolina DOT Construction Sequence: The slope design required primary geogrid reinforcement to be placed at 2 ft vertical spacing for the bottom third of the slope and 6 ft vertical spacing in the upper third of the slope. The geogrid embedment lengths required to satisfy overall slope [...] Transport Authority Engineer: GHD Limited Contractor: Fulton Hogan Purpose: Support Structure for Roadway Geosynthetic Material: Reinforcement: Polyethylene Geogrid Slope Face: Wire Mesh Foundation Soil: Collovium/Fractured Rock Layer Slope Height: 39 ft Slope Angle: 65° to 70° Slope Face Area: 10,700 ft2 Design Method: Static and seismic slope stability analysis. Construction Specifications: New Zealand Transport Authority Construction Sequence: The final solution incorporated an in-situ [...] Slope Height: 10 ft to 30 ft Slope Length: 425 ft Slope Angle: 1H:1V Construction Specifications: Maine Department of Transportation Construction Sequence: The contractor built temporary forms to aid in the construction of the 1H:1V slope and up to 25 layers of geotextile with embedment lengths of up to 25 ft were used with select backfill. The contractor was able to spread the reinforced soil and compact to 95% of standard Proctor effort. The lower zone reinforcing fabric was spaced at 1
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fdotblob.core.windows.net
article
https://fdotwww.blob.core.windows.net/sitefinity/docs/default-source/roadway/…
soil properties for the fill material chosen by the contractor meet or exceed those used in the redesign. See Standard Specifications, Section 145 for requirements associated with contractor-initiated redesigns. 263.4 Geosynthetic Reinforcement Design Considerations Only those geosynthetic products approved for usage on reinforced soil slopes in the APL are eligible for use on FDOT projects. Design the geosynthetic reinforced systems using comprehensive stability analyses methods that address [...] Topic #625-000-002 FDOT Design Manual 263 - Geosynthetic Design 263 Geosynthetic Design 263.1 General This chapter provides design guidance for geosynthetic reinforced soil slopes and geosynthetic reinforced foundations over soft soils. “Geosynthetic” is a generic term for all synthetic materials used in geotechnical engineering applications and includes geotextiles and geogrids. Reinforced soil slopes should be utilized only when unreinforced slopes are not appropriate and retaining walls are [...] in the APL for each approved geosynthetic product. 263.6 Geosynthetic Reinforcement Design Guidelines These design guidelines are excerpted from the FHWA Publications (a) FHWA GEC 011 (FHWA-NHI-10-024 & FHWA-NHI-10-025), "Design and Construction of Mechanically Stabilized Earth Walls and Reinforced Soil Slopes-Volumes 1 & 2", and (b) No. FHWA HI-95-038, "Geosynthetic Design and Construction Guidelines". Designers should refer to these publications for further details. (1) Reinforced Slope - see
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scdot.org
article
https://www.scdot.org/content/dam/scdot-legacy/business/pdf/geotech/2022-by-c…
factors for products in the product line not specifically tested using the reduction factors determined for the products in the product line that are specifically tested for each degradation mechanism. The AASHTO LRFD Specifications provide minimum requirements for the assessment of Tal for use in the design of geosynthetic reinforced soil structures. Protocols for evaluating Tal are included in Berg, et al. – Vol. I (2009) with supporting information on testing procedures provided in Elias, et [...] reinforced slope with a computer program. Layout includes number, length, design strength, and vertical distribution of the geosynthetic reinforcement. The charts presented in Figure D-8 provide a method for generating a preliminary layout. Note that these charts were developed with the specific assumptions noted in this figure. Analyze the reinforced soil slope with the trial geosynthetic reinforcement layouts. The most economical reinforcement layout must provide the maximum stability [...] E. and Boedeker, R. H., (1989) “Geosynthetic Reinforced Soil Structures”, Journal of Geotechnical Engineering, ASCE, Volume 115, Issue 10, p. 1459-1478. Ruegger, R., (1986), “Geotextile Reinforced Soil Structures on which Vegetation can be Established”, Proceedings of the 3rd International Conference on Geotextiles, Vienna, Austria, Volume II. SCDOT Standard Specifications for Highway Construction (2007), South Carolina Department of Transportation, Geotechnical Design Manual APPENDIX D
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dot.ca.gov
official
https://dot.ca.gov/-/media/dot-media/programs/engineering/documents/geotechni…
geogrid and biaxial geogrid. Place geosynthetic reinforcements horizontally. Select a set of LTS from the table of primary geosynthetic reinforcements in the Standard Specifications section 96-1.02D(2) as shown below: Primary Geosynthetic Reinforcement • • • For slope heights less than 25 feet, use a set of at least 2 different geosynthetic reinforcements that allows for selection of 2 LTS during analysis and design. For slopes higher than 25 feet, use a set of at least 3 different geosynthetic [...] which will require additional reinforced soil placement and compaction work. Note: Section 19-6.03C of Standard Specifications stipulates, “… Construct embankment in layers. The loose thickness of each layer must not exceed 8 inches.” The typical vertical spacing between primary geosynthetic reinforcements is 4 feet. The vertical spacing for the top layer near the top of the slope may be increased to 6 feet. The vertical spacing at the bottom of the slope may be 2 feet or smaller depending on [...] Geosynthetic Reinforced Embankments September 2023 Page 1 of 17 1 Reinforced Embankments Geosynthetic Reinforced Embankment (GRE) is a system that incorporates planar geosynthetic reinforcement within a slope (Figure 1) for slope inclinations less than 70 degrees from horizontal. A GRE is also referred to as a Reinforced Soil Slope. Situations where GRE may be used include: • • • • Limited right of way Shortage of fill quantity for slope construction Excess of excavated materials Distressed or
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cherokeemfg.com
article
https://cherokeemfg.com/reinforced-soil-slope-walls-rss-walls-installation
A reinforced soil slope is defined as a compacted fill embankment that incorporates geosynthetic reinforcement to increase the soil shear to enhance the stability of the embankment when site conditions require an embankment with a steeper angle of repose (how steep soil can naturally be piled relative to a horizontal plane) or if the embankment is intended to carry a load considered unstable with the existing subgrade. [...] When building a reinforced slope, we will primarily depend on a secondary reinforcement with a light to moderate geosynthetic fabric or grid in tight vertical spacing with relatively short embedment lengths (how far horizontally into the slope these extend). These layers will provide superficial stability to protect the embankment from shallow plane failure at the surface, while also giving compaction equipment a good platform in which to compact soil lifts all the way to the face of the slope. [...] ### Step 4 – Slope Finishing / Erosion Control
When all soil lifts and geosynthetic have been placed according to construction drawings, finish slope with either a soil treatment and final erosion control blanket, or by establishing vegetation through the facia treatment and wire baskets as indicated by an engineer.
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sciencedirect.com
article
https://www.sciencedirect.com/science/article/pii/S0266114417301024
by AH Abd · 2017 · Cited by 130 — geosynthetic reinforcements for slopes are calculated assuming the ground strength to be purely frictional, ranging from 40° to 90° and reinforced
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buildsite.com
article
https://www.buildsite.com/pdf/tcmirafi/Solmax-Geosynthetic-Solutions-Facing-o…
This system is designed for these applications. For more information on PROPEX Scourlok, please see the Solmax Technical Note on nature based erosion control solutions. Figure 5: Typical reinforced soil slope with geotextile filter fabric placed under the rip rap face protection 3 Reinforced slopes with a geosynthetic wrap face Reinforced slopes that are 1(H): 1(V) and steeper typically require facing support during construction (FHWA, 2009b). A geosynthetic face wrap and/or a hard armor facing [...] Reinforced soil slopes (RSS) are defined as structures with face inclinations of less than 70 degrees from the horizontal (FHWA, 2009a). A critical aspect of the design of reinforced slopes is the facing system. The erosion protection facilitates vegetation establishment and/or provides structural support for forming “over-steepened” slopes. The secondary reinforcement facilitates compaction and helps prevent surficial sloughing at the slope face. Figure 1 shows a general cross section and the [...] Setback varies 1.0 ft. for 1H:1V slope Temporary structure wrap face Temporary RSS structures have a design life of less than 3 years and therefore wrapped face geosynthetic structures are not required to resist UV degradation. In these cases, the geogrid reinforcement (which is typically not UV stable) can wrap up the face. When wrapping the slope face, the reinforcement is turned up at the face and returned a minimum of 3 feet (1 meter) into the slope below the next reinforcement layer (FHWA,